SO(2) invariants of a set of 2 x 2 matrices.
Mathematica Scandinavica, Tome 65 (1989) no. 2, pp. 59-66.

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Mots-clés : polynomial invariants, SO(2, C), SO(2, R), traces, Pfaffians, minimal basis
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     author = {Helmer Aslaksen},
     title = {SO(2) invariants of a set of 2 x 2 matrices.},
     journal = {Mathematica Scandinavica},
     pages = {59--66},
     publisher = {mathdoc},
     volume = {65},
     number = {2},
     year = {1989},
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     url = {http://geodesic.mathdoc.fr/item/MS2_1989__65_2_167066/}
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Helmer Aslaksen. SO(2) invariants of a set of 2 x 2 matrices.. Mathematica Scandinavica, Tome 65 (1989) no. 2, pp. 59-66. http://geodesic.mathdoc.fr/item/MS2_1989__65_2_167066/